public string ReadJoinAGG(Match joinMatch)
{
string listAgg = string.Empty;
// get join meta
string joinPack = joinMatch.Groups ["JOIN_PACK"].Value;
string joinAttrName = joinMatch.Groups ["JOIN_ATTR_NAME"].Value;
string joinTableName = joinMatch.Groups ["JOIN_TABLE_NAME"].Value;
joinTableName = string.IsNullOrEmpty(joinTableName) ? joinAttrName : joinTableName;
CaptureCollection joinValCaps = joinMatch.Groups ["JOIN_VALUES"].Captures;
foreach (Capture cap in joinValCaps)
{
Match attrMatch = Regex.Match(cap.Value, DBPatternHelper.GetQueryAttrPattern());
if (attrMatch.Success == true)
{
string attrName = attrMatch.Groups ["ATTR_NAME"].Value;
string colName = attrMatch.Groups ["COL_NAME"].Value;
if (string.IsNullOrEmpty(listAgg))
{
listAgg = $"'\"{attrName}\":' || '\"' || {joinAttrName}.{colName} || '\"'";
}
else
{
listAgg += $" || ',' || '\"{attrName}\":' || '\"' || {joinAttrName}.{colName} || '\"'";
}
}
}
listAgg = string.IsNullOrEmpty(listAgg) ? listAgg : "LISTAGG(('{' || " + listAgg + " || '}'), ',')";
return(string.IsNullOrEmpty(listAgg) ? null : ((joinPack == "1") ? listAgg : $"('[' || {listAgg} || ']')") + " AS " + "JOIN_" + joinAttrName);
}
public override string ReadSqlParser(string jsonQuery)
{
//reset query
this.ResetReadQuery();
jsonQuery = StringHelper.Simpler(jsonQuery, Pattern.PATTERN_SPECIAL_CHARS);
Match m = Regex.Match(jsonQuery, DBPatternHelper.GetQueryPattern());
if (m.Success == true)
{
Group objGroup = m.Groups ["OBJECT"];
Match objMatch = this.ReadObjParser(objGroup.Value);
if (objMatch == null)
{
return(null);
}
CaptureCollection attrCaps = m.Groups ["ATTRIBUTES"].Captures;
foreach (Capture cap in attrCaps)
{
string attr = cap.Value;
ReadAttributeParser(attr, objMatch);
}
CaptureCollection joinCaps = m.Groups ["JOIN_OBJECTS"].Captures;
foreach (Capture cap in joinCaps)
{
this.ReadJoinParser(cap.Value);
}
}
else
{
Console.WriteLine("Match failed.");
}
return(StringHelper.Simpler($@"
{this.Select}
{this.From}
{this.Join}
{this.Where}
{this.GroupBy}
{this.Having}
{this.OrderBy}
{this.Limit}
{this.Offset}
" ));
}
// detect JOIN by VIEW (SELECT) or JOIN by TABLE
public bool IsReadJoinByView(Match joinMatch)
{
//check JOIN PACK
string joinPack = joinMatch.Groups ["JOIN_PACK"].Value;
//defaul join pack is all
joinPack = string.IsNullOrEmpty(joinPack) ? "ALL" : joinPack;
if (joinPack.ToUpper() != "ALL")
{
return(true);
}
//check Join Values has functions
CaptureCollection joinValCaps = joinMatch.Groups ["JOIN_VALUES"].Captures;
foreach (Capture cap in joinValCaps)
{
Match attrMatch = Regex.Match(cap.Value, DBPatternHelper.GetQueryAttrPattern());
if (attrMatch.Success == true)
{
CaptureCollection anoCaps = attrMatch.Groups ["ANOTATIONS"].Captures;
foreach (Capture anoCap in anoCaps)
{
Match anoMatch = Regex.Match(anoCap.Value, DBPatternHelper.GetQueryAttrAnotationPattern());
if (anoMatch.Success == true)
{
string anoName = anoMatch.Groups ["ANOTATION_NAME"].Value;
switch (anoName.ToUpper())
{
case "MIN":
case "MAX":
case "COUNT":
case "SUM":
case "AVG":
return(true);
default:
return(false);
}
}
}
}
}
return(false);
}
public Match ReadObjParser(string objStr)
{
Match objMatch = Regex.Match(objStr, DBPatternHelper.GetQueryObjPattern());
if (objMatch.Success == true)
{
// 1. Parser table Identifier
string objName = objMatch.Groups ["OBJ_NAME"].Value;
if (string.IsNullOrEmpty(objName))
{
return(null);
}
this.ObjName = objName;
string tableName = objMatch.Groups ["OBJ_TABLE_NAME"].Value;
tableName = string.IsNullOrEmpty(tableName) ? objName : tableName + " AS " + objName;
this.From = $"FROM {tableName}";
// 2. Parser table condition
string condition = objMatch.Groups ["OBJ_CONDITION"].Value;
if (!string.IsNullOrEmpty(condition))
{
this.Where = $"WHERE {condition}";
}
// 3. Parser pack
string pack = objMatch.Groups ["OBJ_PACK"].Value;
pack = (string.IsNullOrEmpty(pack) ? "ALL" : pack).ToUpper();
if (!string.IsNullOrEmpty(pack))
{
if (pack != "ALL")
{
Match packByPageMatch = Regex.Match(pack, DBPatternHelper.GetQueryObjPackPagePattern());
Match packByAmount = Regex.Match(pack, "^(?<AMOUNT>\\d+)$");
if (packByPageMatch.Success == true)
{
// 1. pack by Page
int pageIndex = Convert.ToInt32(packByPageMatch.Groups ["PAGE_INDEX"].Value);
int amount = Convert.ToInt32(packByPageMatch.Groups ["AMOUNT"].Value);
if (amount != 0)
{
this.Limit = $"LIMIT {amount}";
this.Offset = $"OFFSET {(pageIndex - 1) * amount}";
}
}
else if (packByAmount.Success == true)
{
// 2. pack by amount
int amount = Convert.ToInt32(packByAmount.Groups ["AMOUNT"].Value);
if (amount != 0)
{
this.Limit = $"LIMIT {amount}";
if (amount == 1)
{
this.IsReadToList = false;
}
}
}
}
}
return(objMatch);
}
else
{
Console.WriteLine("OBJ not match!");
return(null);
}
}
public void ReadJoinParser(string joinStr)
{
Match joinMatch = Regex.Match(joinStr, DBPatternHelper.GetQueryJoinPattern());
if (joinMatch.Success == true)
{
string joinType = joinMatch.Groups ["JOIN_TYPE"].Value.ToUpper();
string joinCondition = joinMatch.Groups ["JOIN_CONDITION"].Value;
string joinAttrName = joinMatch.Groups ["JOIN_ATTR_NAME"].Value;
string joinTable = joinMatch.Groups ["JOIN_TABLE_NAME"].Value;
joinTable = string.IsNullOrEmpty(joinTable) ? joinAttrName : joinTable;
string joinTableCondition = string.Empty;
string joinPack = joinMatch.Groups ["JOIN_PACK"].Value;
//check IsReadJoinByView
if (this.IsReadJoinByView(joinMatch))
{
// JOIN by VIEW
string joinViewQuery = joinMatch.Groups ["JOIN_TABLE"].Value;
DB2SqlParser joinViewParser = new DB2SqlParser();
joinViewParser.IsJoinView = true;
joinTable = "(" + joinViewParser.ReadSqlParser(joinViewQuery) + ")";
}
else
{
// JOIN by TABLE
joinTableCondition = joinMatch.Groups ["JOIN_TABLE_CONDITION"].Value;
}
// check join type
switch (joinType)
{
case "LEFT":
case "RIGHT":
case "INNER":
case "OUTER":
break;
default:
joinType = "INNER";
break;
}
// JOIN
this.Join += $" {joinType} JOIN {joinTable} AS {joinAttrName} ON {joinCondition}";
if (!string.IsNullOrEmpty(joinTableCondition))
{
this.Join += $" AND ({joinTableCondition})";
}
// GENERATE SELECT LISTAGG
string joinAgg = this.ReadJoinAGG(joinMatch);
if (joinAgg != null)
{
if (string.IsNullOrEmpty(this.Select))
{
this.Select = $"SELECT {joinAgg}";
}
else
{
this.Select += $", {joinAgg}";
}
}
}
else
{
Console.WriteLine("Join not match!");
}
}
public void ReadAttributeParser(string attrStr, Match objMatch)
{
// Get object value
string objName = objMatch.Groups ["OBJ_NAME"].Value;
string objTableName = objMatch.Groups ["OBJ_TABLE_NAME"].Value;
objTableName = string.IsNullOrEmpty(objTableName) ? objName : objTableName;
// Parser Attribute
Match attrMatch = Regex.Match(attrStr, DBPatternHelper.GetQueryAttrPattern());
if (attrMatch.Success == true)
{
string attrName = attrMatch.Groups ["ATTR_NAME"].Value;
string colDeclare = attrMatch.Groups ["COL_NAME"].Value;
colDeclare = string.IsNullOrEmpty(colDeclare) ? attrName : colDeclare;
string colName = colDeclare;
bool mustGroup = true;
if (!string.IsNullOrEmpty(attrName))
{
// 1. Anotaion parser
CaptureCollection anoCaps = attrMatch.Groups ["ANOTATIONS"].Captures;
foreach (Capture anoCap in anoCaps)
{
Match anoMatch = Regex.Match(anoCap.Value, DBPatternHelper.GetQueryAttrAnotationPattern());
if (anoMatch.Success == true)
{
string anoName = anoMatch.Groups ["ANOTATION_NAME"].Value.ToUpper();
string anoMeta = anoMatch.Groups ["ANOTATION_META"].Value.ToUpper();
switch (anoName)
{
case "COUNT":
case "SUM":
case "MIN":
case "MAX":
case "AVG":
colName = anoName + "(" + objName + "." + colName + ")";
if (!string.IsNullOrEmpty(anoMeta))
{
anoMeta = $"{colName}{anoMeta}";
if (string.IsNullOrEmpty(this.Having))
{
this.Having = $"HAVING {anoMeta}";
}
else
{
this.Having += $" AND {anoMeta}";
}
}
// Calculator Funcs don't GROUP BY
mustGroup = false;
break;
case "DISTINCT":
colName = anoName + " " + objName + "." + colName;
break;
case "ORDER":
string orderVal = attrName;
switch (anoMeta)
{
case "DESC":
orderVal += $" {anoMeta}";
break;
default:
break;
}
if (string.IsNullOrEmpty(this.OrderBy))
{
this.OrderBy = $"ORDER BY {orderVal}";
}
else
{
this.OrderBy += $", {orderVal}";
}
break;
default:
break;
}
}
}
//check must GROUP
if (mustGroup)
{
if (string.IsNullOrEmpty(this.GroupBy))
{
this.GroupBy = $"GROUP BY {objName}.{colDeclare}";
}
else
{
this.GroupBy += $", {objName}.{colDeclare}";
}
}
// 2. Name Parser
attrName = (colName != colDeclare ? colName : objName + "." + colName) + " AS " + (this.IsJoinView ? colDeclare : attrName);
if (string.IsNullOrEmpty(this.Select))
{
this.Select = $"SELECT {attrName}";
}
else
{
this.Select += $", {attrName}";
}
}
}
else
{
Console.WriteLine("Attributes not match!");
}
}
